Yum Install Update Repo Error All mirror urls are not using ftp https or file in Linux Cent OS.

“YumRepo Error: All mirror URLs are not using ftp, http[s] or file”  Invalid release/repo/arch combination/ removing mirrorlist with no valid mirrors: /var/cache/yum/x86_64/6/base/mirrorlist txt.

“Error: Cannot find a valid baseurl for repo: base”  In order to resolve this kind of issue I would like to strongly recommend to first take backup of your old Base.repo file.First run update to refresh repos
root@techitadmin html]# yum -y update 
[root@techitadmin html]# cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo-bak. Then copy and replace your existing Base.repo with this new modified repository file in your “/etc/yum.repos.d/CentOS-Base.repo”. 
 Download from here CentOS-Base.repo.
Now run #yum update command.
It will update with new repo, in-case if you see some more error just run following command.[root@techitadmin html]# yum update –skip-broken